EP 2065550 A1 20090603 - Micropore engagement surface for earth boring bit
Title (en)
Micropore engagement surface for earth boring bit
Title (de)
Mikroporeneingriffsflächen für Erdbohrmeissel
Title (fr)
Surfaces de prise de micropores d'un outil de forage
Publication
Application
Priority
- EP 05852695 A 20051202
- US 313204 A 20041203
Abstract (en)
An earth boring bit has sliding engaging surfaces between a cone assembly and a bearing pin. Micropores are formed in at least one of the engaging surfaces. Each of the micropores has a leading portion and a trailing portion. The leading portion is at a more gradual slope than the trailing portion. The micropores are located in a pattern of a greater density in a region of the engaging surfaces that operate at higher pressures than in other regions.
IPC 8 full level
E21B 10/24 (2006.01)
CPC (source: EP US)
E21B 10/24 (2013.01 - EP US); F16C 33/102 (2013.01 - EP US); F16C 2240/40 (2013.01 - EP US); F16C 2240/44 (2013.01 - EP US); F16C 2352/00 (2013.01 - EP US)
Citation (applicant)
- US 4727942 A 19880301 - GALLE EDWARD M [US], et al
- US 4753304 A 19880628 - KELLY JR JOSEPH L [US]
Citation (search report)
- [A] US 4257654 A 19810324 - KEEPERS HUGH E
- [A] US 3784264 A 19740108 - JACKSON G
- [A] US 6002100 A 19991214 - ETSION IZHAK [IL]
- [A] US 4323401 A 19820406 - BELKE WILLIAM H, et al
Designated contracting state (EPC)
BE DE GB IE IT NL
Designated extension state (EPC)
AL BA HR MK YU
DOCDB simple family (publication)
WO 2006060608 A2 20060608; WO 2006060608 A3 20060908; DE 602005014385 D1 20090618; EP 1828535 A2 20070905; EP 1828535 B1 20090506; EP 2065550 A1 20090603; US 2006120640 A1 20060608; US 7241049 B2 20070710
DOCDB simple family (application)
US 2005043533 W 20051202; DE 602005014385 T 20051202; EP 05852695 A 20051202; EP 09004021 A 20051202; US 313204 A 20041203